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      <p>首先一起看看下面这张图：<br><img src="/images/20231209/20231209001.png"></p>
<p>通过前面锁屏加载流程可以知道在KeyguardSecurityContainer中使用getSecurityView()根据不同的securityMode inflate出来，并添加到界面上的。<br>我们知道，Pattern锁所使用的layout是 R.layout.keyguard_pattern_view；</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">&lt;com.android.keyguard.KeyguardPatternView ...&gt;</span><br><span class="line">...</span><br><span class="line">            &lt;com.android.internal.widget.LockPatternView</span><br><span class="line">                android:id=<span class="string">&quot;@+id/lockPatternView&quot;</span></span><br><span class="line">                android:layout_width=<span class="string">&quot;match_parent&quot;</span></span><br><span class="line">                android:layout_height=<span class="string">&quot;0dp&quot;</span></span><br><span class="line">                android:layout_weight=<span class="string">&quot;1&quot;</span></span><br><span class="line">                android:layout_marginEnd=<span class="string">&quot;8dip&quot;</span></span><br><span class="line">                android:layout_marginBottom=<span class="string">&quot;4dip&quot;</span></span><br><span class="line">                android:layout_marginStart=<span class="string">&quot;8dip&quot;</span></span><br><span class="line">                android:layout_gravity=<span class="string">&quot;center_horizontal&quot;</span></span><br><span class="line">                android:gravity=<span class="string">&quot;center&quot;</span></span><br><span class="line">                android:clipChildren=<span class="string">&quot;false&quot;</span></span><br><span class="line">                android:clipToPadding=<span class="string">&quot;false&quot;</span> /&gt;</span><br><span class="line">...</span><br><span class="line">    &lt;/FrameLayout&gt;</span><br><span class="line">&lt;/com.android.keyguard.KeyguardPatternView&gt;</span><br></pre></td></tr></table></figure>
<p>那么图案解锁的滑动事件处理，就是在LockPatternView，是一个系统公共控件，下面我们就分析一下这个view是如何处理触摸输入的：<br><strong>frameworks/base/core/java/com/android/internal/widget/LockPatternView.java</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line"><span class="keyword">public</span> <span class="type">boolean</span> <span class="title function_">onTouchEvent</span><span class="params">(MotionEvent event)</span> &#123;</span><br><span class="line">    <span class="keyword">if</span> (!mInputEnabled || !isEnabled()) &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">switch</span>(event.getAction()) &#123;</span><br><span class="line">        <span class="keyword">case</span> MotionEvent.ACTION_DOWN:</span><br><span class="line">            handleActionDown(event);</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">        <span class="keyword">case</span> MotionEvent.ACTION_UP:</span><br><span class="line">            handleActionUp();</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">        <span class="keyword">case</span> MotionEvent.ACTION_MOVE:</span><br><span class="line">            handleActionMove(event);</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">        <span class="keyword">case</span> MotionEvent.ACTION_CANCEL:</span><br><span class="line">            <span class="keyword">if</span> (mPatternInProgress) &#123;</span><br><span class="line">                setPatternInProgress(<span class="literal">false</span>);</span><br><span class="line">                resetPattern();</span><br><span class="line">                notifyPatternCleared();</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">if</span> (PROFILE_DRAWING) &#123;</span><br><span class="line">                <span class="keyword">if</span> (mDrawingProfilingStarted) &#123;</span><br><span class="line">                    Debug.stopMethodTracing();</span><br><span class="line">                    mDrawingProfilingStarted = <span class="literal">false</span>;</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>几种事件类型：</p>
<table>
<thead>
<tr>
<th>事件</th>
<th>简介</th>
</tr>
</thead>
<tbody><tr>
<td>ACTION_DOWN</td>
<td>手指初次触摸到屏幕时触发</td>
</tr>
<tr>
<td>ACTION_MOVE</td>
<td>手指在屏幕上滑动时触发，会多次触发</td>
</tr>
<tr>
<td>ACTION_UP</td>
<td>手指离开屏幕时触发</td>
</tr>
<tr>
<td>ACTION_CANCEL</td>
<td>事件被上层拦截时触发</td>
</tr>
<tr>
<td>ACTION_OUTSIDE</td>
<td>手指不在控件区域时触发</td>
</tr>
</tbody></table>
<p>不同的MotionEvent对应几个不同的handle方法处理，代码行数太多，我们这里大致总结如下:</p>
<ul>
<li>ACTION_DOWN(handleActionDown)：根据触摸事件的坐标，使用算法detectAndAddHit(x, y)获取是否有命中的点，如果有，会调用addCellToPattern将命中的Cell添加到mPattern中，后即回调mOnPatternListener.onPatternStart()通知监听器，KeyguardPatternView实现并监听了OnPatternListener，做了清除安全提示内容的动作。另外计算需要重绘区域，并调用invalidate进行局部重绘。</li>
<li>ACTION_MOVE(handleActionMove)：在这里 LockPatternView会对所有的历史坐标加当前事件坐标遍历for (int i = 0; i &lt; historySize + 1; i++)，获取命中点，另外如果ACTION_DOWN时没有获取到命中点，流程同上面的ACTION_UP,然后也会回调mOnPatternListener.onPatternStart()。最后会把所有motionevent对应的重绘区域进行union，并调用invalidate进行局部重绘。</li>
</ul>
<p>关于历史坐标<br>  为了效率，Android系统在处理ACTION_MOVE事件时会将连续的几个多触点移动事件打包到一个MotionEvent对象中。我们可以通过getX(int)和getY(int)来获得最近发生的一个触摸点事件的坐标，然后使用getHistorical(int,int)和getHistorical(int,int)来获得时间稍早的触点事件的坐标，二者是发生时间先后的关系。所以，我们应该先处理通过getHistoricalXX相关函数获得的事件信息，然后在处理当前的事件信息。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">for</span> (<span class="type">int</span> <span class="variable">i</span> <span class="operator">=</span> <span class="number">0</span>; i &lt; historySize + <span class="number">1</span>; i++) &#123;</span><br><span class="line">    <span class="keyword">final</span> <span class="type">float</span> <span class="variable">x</span> <span class="operator">=</span> i &lt; historySize ? event.getHistoricalX(i) : event.getX();</span><br><span class="line">    <span class="keyword">final</span> <span class="type">float</span> <span class="variable">y</span> <span class="operator">=</span> i &lt; historySize ? event.getHistoricalY(i) : event.getY();</span><br><span class="line"> ...</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<ul>
<li>ACTION_UP(handleActionUp)：如果mPattern不为空的话，会重置mPatternInProgress，取消动画，然后回调mOnPatternListener.onPatternDetected(final List&lt;LockPatternView.Cell&gt; pattern)，这时候就开始图案解锁的验证了。</li>
<li>ACTION_CANCEL：重置pattern状态，回调mOnPatternListener.onPatternCleared()</li>
</ul>
<h4 id="图案解锁验证"><a href="#图案解锁验证" class="headerlink" title="图案解锁验证"></a>图案解锁验证</h4><p><strong>src/com/android/keyguard/KeyguardPatternView.java</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">private</span> <span class="keyword">class</span> <span class="title class_">UnlockPatternListener</span> <span class="keyword">implements</span> <span class="title class_">LockPatternView</span>.OnPatternListener &#123;</span><br><span class="line">...</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">onPatternDetected</span><span class="params">(<span class="keyword">final</span> List&lt;LockPatternView.Cell&gt; pattern)</span> &#123;</span><br><span class="line">       <span class="keyword">if</span> (DEBUG) Log.d(TAG, <span class="string">&quot;onPatternDetected&quot;</span>);</span><br><span class="line">        mKeyguardUpdateMonitor.setCredentialAttempted();</span><br><span class="line">        mLockPatternView.disableInput();</span><br><span class="line">        <span class="keyword">if</span> (mPendingLockCheck != <span class="literal">null</span>) &#123;</span><br><span class="line">            mPendingLockCheck.cancel(<span class="literal">false</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">final</span> <span class="type">int</span> <span class="variable">userId</span> <span class="operator">=</span> KeyguardUpdateMonitor.getCurrentUser();</span><br><span class="line">        <span class="keyword">if</span> (pattern.size() &lt; LockPatternUtils.MIN_PATTERN_REGISTER_FAIL) &#123;</span><br><span class="line">            mLockPatternView.enableInput();</span><br><span class="line">            onPatternChecked(userId, <span class="literal">false</span>, <span class="number">0</span>, <span class="literal">false</span> <span class="comment">/* not valid - too short */</span>);</span><br><span class="line">            <span class="keyword">return</span>;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">if</span> (LatencyTracker.isEnabled(mContext)) &#123;</span><br><span class="line">            LatencyTracker.getInstance(mContext).onActionStart(ACTION_CHECK_CREDENTIAL);</span><br><span class="line">            LatencyTracker.getInstance(mContext).onActionStart(ACTION_CHECK_CREDENTIAL_UNLOCKED);</span><br><span class="line">        &#125;</span><br><span class="line">        mPendingLockCheck = LockPatternChecker.checkCredential(</span><br><span class="line">                mLockPatternUtils,</span><br><span class="line">                LockscreenCredential.createPattern(pattern),    <span class="comment">// 这里跟进去，会发现将 pattern转化成了 byte[]</span></span><br><span class="line">                userId,</span><br><span class="line">                <span class="keyword">new</span> <span class="title class_">LockPatternChecker</span>.OnCheckCallback() &#123;</span><br><span class="line">                    <span class="meta">@Override</span></span><br><span class="line">                    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">onEarlyMatched</span><span class="params">()</span> &#123;</span><br><span class="line">                        <span class="keyword">if</span> (DEBUG) Log.d(TAG, <span class="string">&quot;onEarlyMatched&quot;</span>);</span><br><span class="line">                        <span class="keyword">if</span> (LatencyTracker.isEnabled(mContext)) &#123;</span><br><span class="line">                            LatencyTracker.getInstance(mContext).onActionEnd(</span><br><span class="line">                                    ACTION_CHECK_CREDENTIAL);</span><br><span class="line">                        &#125;</span><br><span class="line">                        onPatternChecked(userId, <span class="literal">true</span> <span class="comment">/* matched */</span>, <span class="number">0</span> <span class="comment">/* timeoutMs */</span>,</span><br><span class="line">                                <span class="literal">true</span> <span class="comment">/* isValidPattern */</span>);</span><br><span class="line">                    &#125;</span><br><span class="line">                    <span class="meta">@Override</span></span><br><span class="line">                    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">onChecked</span><span class="params">(<span class="type">boolean</span> matched, <span class="type">int</span> timeoutMs)</span> &#123;</span><br><span class="line">                        <span class="keyword">if</span> (DEBUG) Log.d(TAG, <span class="string">&quot;onChecked matched:&quot;</span> + matched);</span><br><span class="line">                        <span class="keyword">if</span> (LatencyTracker.isEnabled(mContext)) &#123;</span><br><span class="line">                            LatencyTracker.getInstance(mContext).onActionEnd(</span><br><span class="line">                                    ACTION_CHECK_CREDENTIAL_UNLOCKED);</span><br><span class="line">                        &#125;</span><br><span class="line">                        mLockPatternView.enableInput();</span><br><span class="line">                        mPendingLockCheck = <span class="literal">null</span>;</span><br><span class="line">                        <span class="keyword">if</span> (!matched) &#123;</span><br><span class="line">                            onPatternChecked(userId, <span class="literal">false</span> <span class="comment">/* matched */</span>, timeoutMs,</span><br><span class="line">                                    <span class="literal">true</span> <span class="comment">/* isValidPattern */</span>);</span><br><span class="line">                        &#125;</span><br><span class="line">                    &#125;</span><br><span class="line">                    <span class="meta">@Override</span></span><br><span class="line">                    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">onCancelled</span><span class="params">()</span> &#123;</span><br><span class="line">                       <span class="keyword">if</span> (DEBUG) Log.d(TAG, <span class="string">&quot;onCancelled&quot;</span>);</span><br><span class="line">                        <span class="comment">// We already got dismissed with the early matched callback, so we</span></span><br><span class="line">                        <span class="comment">// cancelled the check. However, we still need to note down the latency.</span></span><br><span class="line">                        <span class="keyword">if</span> (LatencyTracker.isEnabled(mContext)) &#123;</span><br><span class="line">                            LatencyTracker.getInstance(mContext).onActionEnd(</span><br><span class="line">                                    ACTION_CHECK_CREDENTIAL_UNLOCKED);</span><br><span class="line">                        &#125;</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;);</span><br><span class="line">        <span class="keyword">if</span> (pattern.size() &gt; MIN_PATTERN_BEFORE_POKE_WAKELOCK) &#123;</span><br><span class="line">            mCallback.userActivity();</span><br><span class="line">            mCallback.onUserInput();</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">...</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>在绘制密码后手指抬起的时候，如果已存的有效点数达到4个及以上，就会使用LockPatternChecker.checkCredential 方法调用 task.execute() 启动一个AsyncTask， 并在doInBackground中调用LockPatternUtils.checkCredential 进行密码验证，此时pattern会被转化成字节形式（LockscreenCredential.createPattern(pattern)  这里跟进去，会发现将 pattern转化成了 byte[]）</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// LockPatternUtils.java</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">static</span> <span class="type">byte</span>[] patternToByteArray(List&lt;LockPatternView.Cell&gt; pattern) &#123;</span><br><span class="line">    <span class="keyword">if</span> (pattern == <span class="literal">null</span>) &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> <span class="title class_">byte</span>[<span class="number">0</span>];</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">final</span> <span class="type">int</span> <span class="variable">patternSize</span> <span class="operator">=</span> pattern.size();</span><br><span class="line">    <span class="type">byte</span>[] res = <span class="keyword">new</span> <span class="title class_">byte</span>[patternSize];</span><br><span class="line">    <span class="keyword">for</span> (<span class="type">int</span> <span class="variable">i</span> <span class="operator">=</span> <span class="number">0</span>; i &lt; patternSize; i++) &#123;</span><br><span class="line">        LockPatternView.<span class="type">Cell</span> <span class="variable">cell</span> <span class="operator">=</span> pattern.get(i);</span><br><span class="line">        res[i] = (<span class="type">byte</span>) (cell.getRow() * <span class="number">3</span> + cell.getColumn() + <span class="string">&#x27;1&#x27;</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> res;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>最终和密码锁PIN码锁一样，都是远程调用到LockSettingsService 的 checkCredential 接口进行验证。<br>Keyguard接收用户输入的密码会通过Binder到framework层的LockSettingsService，LockSettingsService经过一系列调用会通过getGateKeeperService获取GateKeeperService然后调用verifyChallenge方法将密码继续忘底层传递，framework的调用栈如下：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">java.lang.Throwab</span><br><span class="line">comandroid.locksettings.1locksettings.LockSettingsService. spBasedDoVerifyCredential(LockSettingsService. java:2724)COT3767075server.ocksettingsLockSettingsService.doVerifyCredentia1(LockSettingsSeryice.java:2020comandroservercom android.server.locksettings.LockSettingsService.doVerifyCredential(LockSettingsService. jaya:1999atcom android.server.locksettings.LockSettingsService. checkCredential(LockSettingsService. java:1972)com android.internal.widget.ILockSettings$Stub.onTransact(ILockSettings.java:542atatexecTransactInternal(Binder.java:1159)execTransact(Binder.java:1123)at</span><br><span class="line"> SyntheticPasswordllanager. unwrapPasswordBasedSyntheticPassword(SyntheticPasswordllanager. java: 1016</span><br><span class="line">android.os.Binderandroid.os.Binder</span><br></pre></td></tr></table></figure>

      
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